ZB 22 13 2023 03 Drainage Statement

4 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.1 Wednesday, Apr 5, 2023 Hyd. No. 1 Existing Site (Impervious) Hydrograph type = SCS Runoff Peak discharge = 2.696 cfs Storm frequency = 2 yrs Time to peak = 725 min Time interval = 1 min Hyd. volume = 9,778 cuft Drainage area = 0.840 ac Curve number = 98 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 4.00 min Total precip. = 3.44 in Distribution = Custom Storm duration = NOAA Atlas 14 Type-D.cds Shape factor = 484 Existing Site (Impervious) Q (cfs) Q (cfs) Hyd. No. 1 -- 2 Year 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) Hyd No. 1